各向同性光场对原子束的分步减速

Scheme of Stepped Slowing Rb Atomic Beams by Isotropic Laser Light

通过理论分析计算了积分球中各向同性光场对原子产生的辐射压力,提出了一种新的激光对原子束的减速方案:将原子炉产生的热铷原子束通过五个直径为10 cm的积分球,积分球内部各向同性光场的失谐量从Δ=-70Γ依次减小到Δ=-10Γ,从而可以对原子束进行减速和冷却。通过对减速过程的数值计算结果发现,该方案可以把速度小于331 m/s的原子束减速和冷却到小于1 m/s,接近多普勒极限。

We calculated the radiation force on atoms in an isotropic light produced by an integrating sphere. Then we present a new scheme of atomic beam slowing by 5 integrating spheres which are arranged in series with detuning of laser and atomic transition frequency from -701Γ to -1010 respectively. The numerical results show that we can capture the atoms with velocity less than 331m/s, and slow them down to less than 1 m/s, close to the Doppler limit.